/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.web.client;

import com.cleangwt.user.client.PendingHandler;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.Response;

/**
 * A {@link StatedCallback} with {@link PendingHandler}.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public abstract class PendingCallback extends StatedCallback {

  private final PendingHandler pendingHandler;

  /**
   * Creates a pending callback with the given pending handler.
   * 
   * @param pendingHandler the widget to be blocked
   */
  public PendingCallback(PendingHandler pendingHandler) {
    this.pendingHandler = pendingHandler;
    if (pendingHandler != null) {
      pendingHandler.onPending();
    }
  }

  @Override
  public final void onResponseReceived(Request request, Response response) {
    if (pendingHandler != null) {
      pendingHandler.onFinish();
    }
    super.onResponseReceived(request, response);
  }

}
